JEE Main · 2022 · 26 Jun 2022 · Shift 1 · Laws of Motion

1. (A)When the elevator moves upward with constant acceleration
2. (B)When the elevator moves downward with constant acceleration✓ Correct
3. (C)When the elevator moves upward with uniform velocity
4. (D)When the elevator moves downward with uniform velocity

Answer: (B)

Solution

The apparent weight (normal reaction N) is given by $N=m(g-a)$ when the elevator accelerates downward with acceleration a. Since $a>0$, we have $N<mg$, so the person experiences weight loss. When moving with uniform velocity (options C and D), $a=0$ so $N=mg$ (no weight change). When accelerating upward, $N=m(g+a)>mg$ (weight gain).

JEE Main · 2022 · 26 Jun 2022 · Shift 1 · Single correct option